` 21 ` : is - are learning

` -> ` It + is

` -` HTTD: S + be + V-ing

` 22 `:are - doing

HTTD nghi vấn : Be + S + V-ing ?

DHNB : Now

` 23 `:Does - walk

HTĐ nghi vấn : Do / does + S + V nguyên mẫu

DHNB : everyday

` 24 ` :don't play

HTĐ phủ định : S + don't /doesn't + V nguyên mẫu

` 25 ` : Is - working 

HTTD nghi vấn : Be + S + V-ing ?

DHNB : at the moment

` 26 `  :is doing

HTTD  :  S + be + V-ing ?

DHNB : at the moment

` 27 `  : are playing - play

HTTD  :  S + be + V-ing

DHNB : at the moment

HTD : S + vs/es

DHN : every afternoon

` 28 ` " is - living 

HTTD nghi vấn : Be + S + V-ing ?

DHNB : Now

` 29 ` teaches - is teaching

Cấu trúc : S + Vs/es + but + today / this morning + S + be + V-ing

` 30 `  : is studying 

HTTD  :  S + be + V-ing

21. Is - are learning It + is HTTD: S + be + V-ing 22. Are - doing HTTD nghi vấn : Be + S + V-ing ? DHNB : Now 23. Does - walk HTĐ nghi vấn : Do / does + S + V nguyên mẫu DHNB : everyday 24. Don't play HTĐ phủ định : S + don't /doesn't + V nguyên mẫu 25. Is - working HTTD nghi vấn : Be + S + V-ing ? DHNB : at the moment 26. Is doing HTTD : S + be + V-ing ? DHNB : at the moment 27. Are playing - play HTTD : S + be + V-ing DHNB : at the moment HTD : S + vs/es DHN : every afternoon 28. Is - living HTTD nghi vấn : Be + S + V-ing ? DHNB : Now 29. Teaches - is teaching Cấu trúc : S + Vs/es + but + today / this morning + S + be + V-ing 30. Is studying HTTD : S + be + V-ing